<template>
    <transition name="slide">
        <div class="user-center">
            <div class="back" @click="back">
                <i class="icon-back"></i>
            </div>
            <div class="switches-wrapper">
                <switches @switch="switchItem" :switches="switches" :currentIndex="currentIndex"></switches>
            </div>
            <div ref="playBtn" class="play-btn">
                <i class="icon-play"></i>
                <span class="text" @click.stop="random">随机播放全部</span>
            </div>
            <div class="list-wrapper" ref="listWrapper">
                <scroll ref="favoriteList" class="list-scroll" v-if="currentIndex===0" :data="favoriteList">
                    <div class="list-inner">
                        <song-list :songs="favoriteList" @select="selectSong"></song-list>
                    </div>
                </scroll>
                <scroll ref="playList" class="list-scroll" v-if="currentIndex===1" :data="playHistory">
                    <div class="list-inner">
                        <song-list :songs="playHistory" @select="selectSong"></song-list>
                    </div>
                </scroll>
            </div>
            <div class="no-result-wrapper" v-show="noResult">
                <no-result :title="noResultDesc"></no-result>
            </div>
        </div>
    </transition>
</template>

<script type="text/ecmascript-6">
import Switches from "base/switches/switches";
import Scroll from "base/scroll/scroll";
import SongList from "base/song-list/song-list";
import NoResult from "base/no-result/no-result";
import Song from "common/js/song";
import { mapGetters, mapActions } from "vuex";
import { playlistMixin } from "common/js/mixin";

export default {
  mixins: [playlistMixin],
  data() {
    return {
      currentIndex: 0,
      switches: [{ name: "我喜欢的" }, { name: "最近听的" }]
    };
  },
  computed: {
    noResult() {
      if (this.currentIndex === 0) {
        return !this.favoriteList.length;
      } else {
        return !this.playHistory.length;
      }
    },
    noResultDesc() {
      if (this.currentIndex === 0) {
        return "暂无收藏歌曲";
      } else {
        return "你还没有听过歌曲";
      }
    },
    ...mapGetters(["favoriteList", "playHistory"])
  },
  components: {
    Switches,
    Scroll,
    SongList,
    NoResult
  },
  methods: {
    back() {
      this.$router.back();
    },
    switchItem(index) {
      this.currentIndex = index;
    },
    random() {
      let list = this.currentIndex === 0 ? this.favoriteList : this.playHistory;
      if (list.length === 0) {
        return;
      }
      //这里要构造song对象是因为如果不构造里面就没有getLyric这个方法
      list = list.map(song => {
        return new Song(song);
      });
      this.randomPlay({
        list
      });
    },
    handlePlaylist(playlist) {
      const bottom = playlist.length > 0 ? "60px" : "";
      this.$refs.listWrapper.style.bottom = bottom;
      this.$refs.favoriteList && this.$refs.favoriteList.refresh();
      this.$refs.playList && this.$refs.playList.refresh();
    },
    selectSong(song) {
      this.insertSong(new Song(song));
    },
    ...mapActions(["insertSong", "randomPlay"])
  }
};
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
@import '~common/stylus/variable';

.user-center {
    position: fixed;
    top: 0;
    bottom: 0;
    z-index: 100;
    width: 100%;
    background: $color-background;

    &.slide-enter-active, &.slide-leave-active {
        transition: all 0.3s;
    }

    &.slide-enter, &.slide-leave-to {
        transform: translate3d(100%, 0, 0);
    }

    .back {
        position: absolute;
        top: 0;
        left: 6px;
        z-index: 50;

        .icon-back {
            display: block;
            padding: 10px;
            font-size: $font-size-large-x;
            color: $color-theme;
        }
    }

    .switches-wrapper {
        margin: 10px 0 30px 0;
    }

    .play-btn {
        box-sizing: border-box;
        width: 135px;
        padding: 7px 0;
        margin: 0 auto;
        text-align: center;
        border: 1px solid $color-text-l;
        color: $color-text-l;
        border-radius: 100px;
        font-size: 0;

        .icon-play {
            display: inline-block;
            vertical-align: middle;
            margin-right: 6px;
            font-size: $font-size-medium-x;
        }

        .text {
            display: inline-block;
            vertical-align: middle;
            font-size: $font-size-small;
        }
    }

    .list-wrapper {
        position: absolute;
        top: 110px;
        bottom: 0;
        width: 100%;

        .list-scroll {
            height: 100%;
            overflow: hidden;

            .list-inner {
                padding: 20px 30px;
            }
        }
    }

    .no-result-wrapper {
        position: absolute;
        width: 100%;
        top: 50%;
        transform: translateY(-50%);
    }
}
</style>
